KR20120122275A - Metal Product Having Internal Space And Method of Manufacturing The Same - Google Patents

Abstract

PURPOSE: A metal product having an internal space and a method for manufacturing the same are provided to easily form a complex shape of internal space and improve cooling efficiency. CONSTITUTION: A metal product having an internal space comprises a metal product body(110) formed with a first space(111) therein, a space forming member(120) which is installed in the metal product body and formed with a second space(125) connected to the first space, and a finishing part(130) which covers the space forming member installed in the metal product body.

Description

Metal Product Having Internal Space And Method of Manufacturing The Same

The present invention relates to a metal product having an internal space and a method of manufacturing the same, and more particularly, to a metal product and a method of manufacturing the same, which can easily form an internal space formed of a curved surface. In particular, the present invention relates to a metal product having an internal space and a method for manufacturing the same, which can improve the flow of a cooling liquid (cooling water) and improve cooling efficiency in an internal space such as a cooling flow path. And various products that require surface / internal cooling (eg, industrial metal products such as machine tools, devices, etc. with cooling passages).

When manufacturing molds or metal products that require internal cooling (for example, industrial metal products such as machine tools and devices with cooling channels), it is important to form cooling channels to lower the surface temperature and to have a uniform temperature distribution on the surface of the mold. Do.

For example, in the injection mold for producing plastic products, the high temperature of the surface increases the cycle time of the product production, and if the temperature of the mold surface is not uniform, warpage, thickness variation, or a large amount of bubbles occur. There is. On the other hand, if the cooling is performed such that the temperature of the mold surface is low and the temperature distribution is uniform, the overall cooling time is shortened, thereby shortening the cycle time of the product production, thereby increasing productivity and improving the quality of the plastic product.

However, there is a problem in that a conventional metal processing method cannot manufacture a metal mold having a cooling passage of a three-dimensional shape or a metal product requiring cooling.

For example, the string cooling method using gun drilling and the baffle cooling method are virtually impossible to freely arrange the arrangement and shape of the cooling channel.

In addition, since the Joule cooling method and the baffle cooling method cannot form a curved flow path in which the direction of the coolant is changed smoothly, turbulence occurs in the part where the drilling overlaps or the part where the baffle is installed. Or, stagnation occurs in the coolant flow, which causes a problem that the cooling efficiency is extremely low. In particular, the string cooling method using gun drilling and the baffle cooling method have a lot of difficulties in forming the cooling flow path to approach the mold surface.

Recently, with the advent of AF (Additive Fabrication) technology that builds up and manufactures complex shaped metal products and molds directly from three-dimensional CAD data, it is possible to manufacture molds having three-dimensional cooling channels. As a result, it is possible to overcome the limitation of the formation of a complicated flow path by a conventional general metal processing method.

An example of such an additive fabrication (AF) technique is illustrated in FIG. 1. Referring to FIG. 1, the AF technology cuts three-dimensional CAD data to a certain thickness (or height) to form two-dimensional surfaces, and then melts and attaches metal on the base B shown in FIG. By using a sintering method or the like to create a metal layer corresponding to the two-dimensional cross-sectional information {Fig. 1 (b)} and repeatedly stacking another metal layer thereon {Fig. 1 (c)} the final metal of the three-dimensional shape It will produce a product (Fig. 1 (d)).

Most of these AF technologies use metal materials in powder form, which are representative of the powder pre-placement method and ii) real-time during the process of sintering or melting. The metal powder (in-situ powder-feeding method) may be mentioned.

Among the above-mentioned AF technologies, metal powder is applied in a predetermined thickness in advance before the sintering or melting process, and a selective laser sintering (SLS) technique and a selective laser melting (SLM) technique are used. And selective laser melting method) (hereinafter, the SLS technology and the SLM technology will be described as including a brand name such as direct metal laser sintering (DMLS), LaserCUSING, and electron beam manufacturing (EBM)).

The SLS technology and the SLM technology precisely coat a metal powder with a certain thickness, and then selectively irradiate a laser beam or an electron beam on the metal powder to sinter or melt the metal powder to form a two-dimensional metal layer, and then to a constant thickness. By repeating a series of processes of laying the metal powder and selectively sintering or melting to produce a three-dimensional metal product.

In particular, the SLS technology and the SLM technology are advantageous for producing an overhanging structure having a space formed on the lower side because the coated metal powder plays a kind of support (support) in the process, and thus, theoretically, It may be suitable for the structure.

However, since SLS technology and SLM technology use expensive special metal powder, mold manufacturing cost is high, and leakage occurs in the cooling flow path due to defects such as pores and cracks. Because of this roughness, not only the corrosion rate is fast, but also clogging of the cooling flow occurs, and the size of the product that can be manufactured is limited. Therefore, these technologies are not widely used in the production of three-dimensional cooling oil.

Among the AF technologies, ii) in-situ powder-feeding may include direct metal fabrication (DMF) and multilayer laser cladding technology.

This technique is to form a three-dimensional metal product on the base (B) using a molding device (M) having a laser beam irradiator and a powder feeder, as shown in FIG.

Specifically, DMF technology and multi-layered laser cladding technology instantaneously generate a melt pool on a metal surface when a high power laser beam is irradiated onto the metal surface, and supply a precisely controlled metal powder into the melt pool in real time. You will create a layer. At this time, the laser beam (molding apparatus) and / or the base (or the preformed lower metal layer) is moved along the path calculated from the CAD data on the three-dimensional surface to form a metal layer corresponding to the two-dimensional cross section. (Layer-by-layer) Iteratively produces the same metal product as the 3D CAD model.

This DMF technology and multi-layer laser cladding technology can use low-cost general industrial metal powder, obtain dense structure, and achieve fine metallographic structure by fusion bonding by complete melting and rapid solidification in the process. As a result, the physical properties of products made with this technique have the same or better mechanical properties as wrought materials.

In particular, DMF technology and multilayer laser cladding technology, unlike SLS technology or SLM technology, which pre-plies the powder to a predetermined thickness, and supplies the metal powder in real time, the two-dimensional flat base (or preformed There is an advantage that the molding can be performed not only on the lower metal layer) but also on the base having the three-dimensional free curved surface.

However, since DMF technology and multilayer laser cladding technology do not have a metal powder (or metal powder layer) that performs a supporting role, unlike SLS technology or SLM technology, in which metal powder is applied in advance and processes, a space is formed at the bottom. There is a problem that it is not easy to manufacture a structure such as an overhang structure or a cooling flow path.

Therefore, in the DMF technology and the multi-layered laser cladding technology, in order to form an overhang structure (including a cooling flow path having an overhang structure), it is necessary to control complex motion by using complicated and expensive 5-axis equipment.

In addition, in order to form the cooling flow path using the DMF technology and the multilayer laser cladding technology, although the complex motion control of the above 5-axis equipment is performed, most of the cooling flow paths are manufactured using metal powders having low melting points or flexible copper pipes. It is also produced by inserting.

In this case, when the low melting point metal powder is used to form the cooling flow path, the inside of the cooling flow path is filled with the low melting point metal powder, and after the final metal product is manufactured, the low melting point metal is melted and removed by heat treatment. Cooling flow path will be produced. In this case, an additional process is required for the production of the cooling oil, and the surface of the cooling oil is somewhat rough and may cause corrosion (especially galvanic corrosion) if the low melting point metal is not completely removed and remains in the cooling oil. there is a problem.

In the method of inserting a copper tube to form a cooling flow path, as shown in FIG. 3, first, the copper tube 4 may be inserted onto the base 1 using DMF or a multilayer laser cladding technique. After the primary metal product 2 is manufactured to have the seating groove 3 (FIG. 3 (a)), the copper pipe 4 is inserted into the seating groove 3 (FIG. 3 (b)). Subsequently, DMF technology or multilayer laser cladding technology is continued to form the metal layer 5 on the copper pipe 4 (FIG. 3 (c)) to form the final metal product having the copper pipe 4 inserted therein. {FIG. 3 (d)}.

In the case of the copper tube inserting method shown in FIG. 3, the manufacturing of the cooling channel is simple and the surface of the cooling channel is smooth and the corrosion resistance is high. However, the upper side of the copper tube 4 inserted in the molding process is a metal layer (or metal). While forming a complete metal bond with the product (5) (5), the lower side of the copper pipe (4) installed in the seating groove (3) has a problem that the cooling efficiency can be reduced because it is not bonded to the metal product.

In particular, when the copper pipe is bent to form a complicated flow path, the cross section of the bent copper pipe is not constant, and when the bend is severe, turbulence may occur in the flow of the coolant inside the copper pipe.

Furthermore, in the case of the copper pipe insertion method, as described above, the copper pipe 4 should be seated in the seating groove 3, but the copper pipe 4 may not be stably mounted in the seating groove 3. That is, since the seating groove 3 has only a semicircular cross section of the circular cross section of the copper pipe 4, the copper pipe 4 installed in the seating groove 3 does not completely contact the end face of the seating groove 3. It is easy to be excited. This phenomenon occurs as the cooling flow path becomes more complicated as shown in FIG. 3, and the lifting phenomenon becomes more severe when the copper pipe 4 is installed along a three-dimensional path.

As such, when the lifting phenomenon occurs, a lot of difficulty occurs in manufacturing the final metal product shape through DMF processing or multilayer laser cladding processing on the copper pipe 4. Specifically, in DMF processing or multilayer laser cladding processing, metal layers corresponding to two-dimensional cross sections are laminated by moving along a path calculated from three-dimensional CAD data. Differences occur in the actual shape of the copper tube 4, which makes it difficult to achieve perfect molding.

As a result, a method different from the conventional three-dimensional flow path (internal space) formation method using the AF technique is required.

The present invention has been made to solve at least some of the problems of the prior art as described above, a metal product having an internal space is formed to easily form a metal product (mold) having an internal space of a complex shape and a method of manufacturing the same It aims to provide.

In addition, the present invention, as an aspect, the internal space (cooling flow path), which is difficult to manufacture directly by DMF technology or multilayer laser cladding technology, for example, a curvature-shaped portion in which the flow of the coolant is changed, or a space is formed on the lower side and the shape is formed thereon. It is an object of the present invention to provide a metal product having an internal space and a method of manufacturing the same, which can easily produce an overhang structure portion having the same.

In addition, an object of the present invention is to provide a metal product having an internal space having excellent cooling efficiency by making a constant flow path cross-sectional structure, and a method of manufacturing the same.

In addition, an object of the present invention is to provide a metal product and a method of manufacturing the inner space is formed excellent in corrosion resistance.

As one aspect for achieving the above object, the present invention is a metal product body formed with a first space therein; A second space communicating with the first space, the space forming member mounted to the metal product body; And a finishing part covering the space forming member to form an appearance in a state where the space forming member is mounted on the metal product main body.

Preferably, the metal product body is provided with a mounting groove in which the space forming member is mounted, the space forming member may be mounted to a part of the mounting groove and the remaining portion may be exposed to the outside of the metal product body. In contrast, the metal product body is provided with a mounting groove in which the space forming member is mounted, and the space forming member may not be exposed to the outside of the mounting groove.

Also preferably, the space forming member may be formed of one member in which the second space is formed. As another example, the space forming member may be formed by combining two or more separation members, and may be configured to form the second space in a state in which the separation member is coupled.

Preferably, the space forming member may have an overhang structure in which a second space connected to the first space is formed at a lower portion thereof, and a space is formed on the lower side as a whole.

More preferably, the metal product is a mold, the space forming member is made of a metal material, the first space and the second space may constitute a cooling passage. In this case, the space forming member may form a curvature portion in which the direction of the cooling passage is changed, or may form an overhang portion having a space formed on the lower side of the cooling passage.

The space forming member may be formed of the same material as the metal product body or may be formed of a material having greater corrosion resistance than the metal product body.

Also preferably, the finishing part is a metal product having an internal space, characterized in that the metal product body and the metal member is formed with the space forming member.

As another aspect, the present invention provides a process for preparing a metal product body having a first space therein; Preparing a space forming member made of a metal material having a second space communicating with the first space; Mounting the space forming member on the metal product body such that the first space and the second space communicate with each other; And covering the space forming member to form a finishing part corresponding to the appearance of the metal product.

Preferably, the first space of the metal product body includes a straight portion, the straight portion is formed by drilling, the second space of the space forming member includes a curved portion and the curved portion is a cutting, casting, It may be formed by any one of AF processing or a composite processing thereof.

Also preferably, the metal product body and the space forming member are formed by any one of cutting, casting, AF processing, or a combination thereof, and a straight portion constituting the first space of the metal product body is used for drilling. It can be formed by.

Preferably, the finish portion may be metallized with the metal product body and the space forming member.

Also preferably, the finish may be formed by direct metal fabrication (DMF) technology or multilayer laser cladding technology. Alternatively, the finish may be formed by at least one of selective laser sintering (SLS) technology, selective laser melting (SLM) technology, welding, plating, deposition, and thermal spraying.

Preferably, the space forming member is formed by combining two or more separation members, the second space in the state in which the separation member is coupled, the method of manufacturing a metal product having an internal space formed by an aspect of the present invention Joining the boundary of the separating member before or after being mounted in the mounting groove formed in the metal product body may further include.

Meanwhile, the metal product may be a mold, and the first space and the second space may be cooling passages.

In this case, the space forming member may form a curvature portion in which the direction of the cooling passage is changed, or may form an overhang portion having a space formed on the lower side of the cooling passage.

According to an embodiment of the present invention having such a configuration, the inner space (first space) of the metal product body is formed through simple machining such as drilling, and the portion (second space) having a complicated shape in the inner space is formed. By separately manufacturing a space forming member and covering them with a finishing part to form an exterior of a metal product, an effect of easily forming an internal space having a complicated shape can be obtained. In particular, a straight portion constituting the first space of the metal product body is formed by drilling, and the second space including the curved portion is formed by a conventional mechanical machining method (for example, cutting, casting, etc.) or AF processing. (DMF processing or multi-layer laser cladding processing, or the like), or by forming and combining them, it is possible to easily form the internal space of a complex shape. This can reduce the manufacturing time and manufacturing cost of the metal product (mould).

In addition, according to an embodiment of the present invention it is possible to maintain the cross-sectional size of the inner space in a state in which the first space formed in the metal product body and the second space formed in the space forming member are combined, and the coolant naturally changes direction along the curved surface. Since the flow can be converted to flow does not occur in the coolant stagnation or turbulence can improve the cooling efficiency of the metal product. In particular, it is possible to form an internal space (cooling flow path) of a complicated shape so that the temperature of the surface of the metal product can be uniform, thereby improving the structure or performance of the finished product that can be manufactured through the metal product.

According to one embodiment of the present invention, an internal space (cooling flow path) that is difficult to manufacture directly using only conventional DMF technology or multilayer laser cladding technology, for example, a curvature-shaped portion in which a flow of a cooling liquid is changed, or a space is formed at a lower side thereof. Since the overhang structure portion having a shape thereon is formed by using the space forming member, a complex internal space can be formed without complicated control of the 5-axis equipment. In the case of using the low melting point metal powder according to the prior art, the surface of the inner space (cooling flow path) is somewhat rough, and the corrosion (especially when the low melting point metal powder is not completely removed and remains in the inner space (cooling flow path) , Galvanic corrosion), but according to an embodiment of the present invention has a smooth surface has almost no flow resistance and can solve the problem of corrosion.

In addition, in the conventional art of forming an internal space (cooling flow path) using a copper pipe, the cross section of the copper pipe of the bent or bent portion is not constant, and if the bending is severe, turbulence may occur in the flow of the coolant inside the copper pipe. In addition, only about half of the cross section of the copper pipe is combined with the main body of the metal product, which reduces the cooling efficiency. However, according to the exemplary embodiment of the present invention, the cross section of the internal space can be made constant so that the coolant naturally follows the curved surface. Since the flow can be changed by changing the direction, congestion or turbulence of the coolant does not occur, and most surfaces of the space forming member are completely metallized with the main body or finish of the metal product, so that the cooling efficiency is excellent. Through this, the three-dimensional internal space can be efficiently implemented. In the case of the prior art in which the inner space (cooling flow path) is formed using the copper pipe, the copper pipe cannot be stably mounted in the seating groove, so that the floating phenomenon occurs, which causes subsequent DMF processing or multilayer laser cladding processing. Although the AF processing cannot be performed smoothly, according to an embodiment of the present invention, since the space forming member is stably seated in the seating groove, the space forming member and the space forming member when performing the AF processing such as the subsequent DMF processing or the multi-layer laser cladding processing. It is possible to obtain the effect that a stable metallic bonding of the finish is possible.

In addition, according to an embodiment of the present invention, by forming the finish using DMF technology or a multi-layer laser cladding technology, a complete metal bond is formed between the finish and the space forming member and / or the main body of the metal product. It is enough to achieve it.

In addition, according to an embodiment of the present invention, by forming the space forming member with the same material as the metal product body or with a material having higher corrosion resistance than the metal product body, an effect of obtaining a metal product having excellent corrosion resistance can be obtained.

In addition, according to an embodiment of the present invention, by forming the space forming member divided into a plurality of separating members to form an internal space of a complex shape inside the space forming member, introducing a plurality of space forming member to the finishing portion By forming the appearance of the metal product, it is possible to obtain an effect that a cooling flow path that can sufficiently achieve the cooling efficiency can be obtained even in a complicated shape metal product.

1 is an explanatory diagram sequentially showing a work procedure of the prior art for manufacturing a three-dimensional product using AF technology.
2 is an explanatory diagram sequentially showing a work procedure of the prior art for producing a three-dimensional product using DMF technology or multilayer laser cladding technology.
FIG. 3 is an explanatory view sequentially showing a prior art work procedure of inserting a copper tube to form a cooling flow path using a DMF technique and a multilayer laser cladding technique. FIG.
Figure 4 is a perspective view sequentially showing a process of the method of manufacturing a metal product according to an embodiment of the present invention.
Figure 5 (a) and Figure 5 (b) is a view showing various embodiments of the metal product according to the present invention, the left side is a front view, the right side is a sectional view, respectively.
Figure 6 is a view showing another embodiment of a metal product according to the present invention, Figure 6 (a) is a plan view, Figure 6 (b) is a sectional view, Figure 6 (c) is a front view.
Figure 7 (a) and Figure 7 (b) is a view showing another embodiment of a metal product according to the present invention, the left side is a front view, the right side is a sectional view, respectively.
8 is a perspective view showing another embodiment of a metal product according to an embodiment of the present invention, Figure 8 (a) is a perspective view after the installation of the space forming member, Figure 8 (b) after the installation of the finish.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Also, the singular forms in the present specification include plural forms unless the context clearly indicates otherwise.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

4 is a perspective view sequentially showing a process of a method of manufacturing a metal product according to an embodiment of the present invention, Figures 5 (a) and 5 (b) shows various embodiments of the metal product according to the present invention As one view, the left side is a front view and the right side is a sectional view, respectively, and FIG. 6 is a view showing another embodiment of a metal product according to the present invention. FIG. 6 (a) is a plan view, FIG. 6 (b) is a sectional view, Fig. 6C is a front view. In addition, Figure 7 (a) and Figure 7 (b) is a view showing another embodiment of a metal product according to the present invention, the left side is a front view, the right side is a sectional view, respectively, Figure 8 is an embodiment of the present invention Fig. 8 (a) is a perspective view after installation of a space forming member, and Fig. 8 (b) is a view after installation of a finish portion.

However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments shown in the drawings. In particular, Figures 4 to 8 illustrate a simple form of a metal product for convenience of description, but the metal product formed with the internal space according to the present invention is not limited to such a simple shape, or the internal space of a complex shape or It can be applied to many products having an appearance. In addition, in order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

4 to 8, the metal product body 110 corresponding to a straight or simple portion of the internal space of the metal product, as shown in Figures 4 to 8 in a general machining method (for example, cutting or casting, etc.) ) Or AF processing (such as DMF processing or multi-layer laser cladding processing) or composite processing thereof, and then forms the internal space of the metal product body 110 by a simple operation such as drilling, and the shape of the internal space is curved. After forming an intricate or complex part with the space forming member 120, the metal product body 110 and the space forming member 120 are combined with the rest of the exterior of the metal product 100 except for the metal product body 110. By forming the finishing portion 130 corresponding to the metal product (particularly, a mold) having a complicated internal space is characterized in that the formation.

With reference to Figure 4 looks at with respect to the metal product 100 and the method of manufacturing the inner space is formed according to an embodiment of the present invention.

First, the metal product 100 having an internal space according to an embodiment of the present invention, as shown in Figure 4, the metal product body 110, the first space 111 is formed therein, and the metal product A space forming member 120 having a second space 125 connected to the first space 111 formed in the main body 110 and the space forming member 120 are covered to form an exterior of the metal product 100. It is formed including the finish 130.

The metal product 100 according to the present invention may include various products (for example, industrial metal products such as machine tools and devices having a cooling flow path) that require mold or internal or surface cooling, and if space is formed therein, The use and shape are not particularly limited.

However, for convenience of description, an example in which the metal product functions as a mold and the internal space is used as a cooling passage will be mainly described.

The metal product body 110 occupies most of the metal product 100, and a first space 111 is formed therein.

The metal product body 110 is formed through a conventional machining method (for example, cutting, casting, etc.), AF processing (such as DMF processing or multilayer laser cladding processing), or a combination thereof. The first space 111, such as a cooling passage, is formed.

In this case, the first space 111 formed in the metal product body 110 forms a linear or simple space and may be formed by simple machining such as drilling.

Accordingly, the metal product main body 110, which occupies a substantial portion of the metal product, may be easily formed by a general machining method or AF processing, and the first space 111 formed therein may also be easily formed by simple processing. Can be. As a result, the production of the metal product body 110 is very easy to reduce the manufacturing cost and time.

In particular, since the portion forming the overhang structure or the flow path direction of the metal product 100 is described later as the space forming member 120 to be described later, the metal product body 110 is simple in shape and the DMF technology or multilayer It is also possible to easily manufacture using AF technology such as laser cladding technology. At this time, since the metal product body 110 does not have an overhang structure as described above, it is possible to manufacture the metal product body 110 in which the first space 111 is also formed through AF technology such as DMF technology or multilayer laser cladding technology. .

In addition, as shown in Figure 4, the metal product body 110 is formed with a mounting groove 112 to be mounted to the space forming member 120. The mounting groove 112 is preferably formed to be substantially the same size as the space forming member 120 so that at least a portion of the space forming member 120 can be mounted and fixed. As an example, the space forming member 120 may be press-fitted into the mounting groove 112 with a rubber mallet or the like so as to maintain contact with the metal product body 110. However, it is also possible that the mounting groove 112 is not formed in the metal product body 110. In this case, the contact portion is welded or the DMF technology is performed while the second space 125 is connected to the first space 111. It is also possible to join using a multilayer laser cladding technique or the like.

In addition, the mounting groove 112 is exposed to the surface of the metal product body 110 can be easily formed through a simple cutting process.

In addition, the space forming member 120 is formed with a second space 125 is connected to the first space 111 formed in the metal product body 110, the mounting groove 112 of the metal product body 110 ) Is mounted.

In this case, the second space 125 preferably has the same cross-sectional area and shape as the first space 111 in order to minimize flow path resistance applied to the coolant flowing through the first space 111. In addition, it is preferable that both the first space 111 and the second space 125 have a structure of a circular cross section.

As shown in FIG. 4, the space forming member 120 may be formed by combining two or more separation members 121 and 122, and the separation members 121 and 122 may be coupled to each other. It may be configured to form two spaces 125.

As described above, when the space forming member 120 is divided into a plurality of parts, the second space 125 having a complicated shape can be manufactured. That is, when the space forming member 120 is divided into a plurality of curved portions as shown in FIGS. 4 (c) and 5 (a), the curved portion in which the direction of the cooling flow path of the first space 111 is switched (curved surface) Part having) can be easily formed. However, the space forming member 120 is not limited to being assembled after being divided as described above, but may be formed as one member having the second space 125 as shown in FIGS. 5B and 6. .

Like the metal product body 110, the space forming member 120 is a conventional machining method (for example, cutting, casting, etc.), AF processing (such as DMF processing or multilayer laser cladding processing), or a combination thereof It can be formed by processing. In addition, since the second space 125 is exposed to the outside of the separating members 121 and 122 forming the space forming member 120, as shown in FIG. 4, the second space 125 is cut and processed. It can be formed by machining, such as (discharge machining), it is also possible to form simultaneously with the body of the space forming member 120 by casting or AF processing. At this time, when the second space 125 is formed by cutting, the surface is smooth, so that there is an advantage that the flow path resistance is low and the corrosion is less generated.

As such, the second space 125 formed in the space forming member 120 forms a curved portion communicating with the first space 111 so that an internal space having a complicated shape formed in the metal product can be easily formed. Function.

In addition, when the material of the space forming member 120 is made of the same material as the metal product main body 110 or the material having a higher corrosion resistance than the metal product main body 110 by mounting the space forming member 120 It can solve the problem of corrosion. That is, when the mold is manufactured by using the conventional SLS technology and SLM technology, the surface of the produced cooling flow path is rough, so the corrosion speed is high, and the metal of low melting point is formed for the formation of the cooling flow path in the DMF technology and the multilayer laser cladding technology. When the powder is used, the low melting point metal is not completely removed and remains in the cooling flow path, so that corrosion (particularly, galvanic corrosion) may occur, but according to an embodiment of the present invention, the space forming member 120 and the metal product Since the material of the main body 110 is the same or the space forming member 120 may be formed of a corrosion resistant material, the problem of corrosion may be solved.

The finishing unit 130 covers the space forming member 120 while the space forming member 120 is mounted on the metal product body 110 to form an appearance of the metal product.

The finishing unit 130 is the metal product body 110 and the so that the space forming member 120 is not separated from the metal product body 110 and the combination of the finishing and space forming member 120 is completely made. It is preferable that the metal forming coupling with the space forming member 120 is made.

That is, when the finishing unit 130 is metallized with the space forming member 120 and the metal product body 110, the space forming member 120 is finished in the mounting groove 112. Since it is completely coupled with the part 130, it is possible to prevent the separation of the space forming member 120, and the space forming member 120 and the finish 130 is in close contact with the coolant flowing through the second space 125 And heat transfer between the surface of the finish 130 can be made efficiently, thereby maximizing the cooling efficiency even on the surface of the finish 130.

At this time, the mounting groove 112 of the metal product body 110 may be formed to a minimum depth so that the space forming member 120 can maintain the position. Therefore, most of the area of the space forming member 120 is exposed to the outside of the mounting groove 112 can be combined with the finish 130, it is possible to maximize the cooling efficiency. That is, as shown in Figure 3, in the prior art of making the cooling flow path using the copper pipe, the mounting groove 3 for mounting the copper pipe 4 is a depth corresponding to the radius of the copper pipe (4) Since the area of the lower side of the copper pipe (4), that is, half of the copper pipe (4) that is installed in the seating groove (3) can not be joined to the metal product, the cooling efficiency may be lowered. In the case of the embodiment of the present invention, the depth of the mounting groove 112 can be minimized, thereby obtaining an excellent cooling efficiency than the prior art. In particular, in the case of the prior art shown in Figure 3 in order to form a three-dimensional flow path at different heights it is difficult to process the mounting groove (3) for the installation of the copper pipe, or the formation of the mounting groove (3) and copper pipe (4) Although there is a problem that the installation should be repeated continuously, in the case of the embodiment of the present invention, the curvature portion in which the straight portion is formed by gun drilling and the flow path direction is changed adjacent to the surface of the metal product (mold) In addition, by separating the overhang portion with the space forming member 120, there is an advantage that the flow path is easy to install.

In addition, in the prior art of FIG. 3 in which an inner space (cooling flow path) is formed using a copper pipe, the cross section of the copper pipe 4 of the bent or bent portion is not constant, and when the bending is severe, the inside of the copper pipe 4 is severe. Turbulent flow may occur in the flow of the coolant, but according to one embodiment of the present invention, the cross section of the internal space can be made constant so that the coolant can flow in a natural direction along the curved surface so that stagnation or turbulence of the coolant does not occur. Will not. Furthermore, in the prior art of FIG. 3 in which an inner space (cooling flow path) is formed using the copper pipe 4, the copper pipe 4 cannot be stably mounted in the seating groove 3, so that the floating phenomenon occurs. Due to this, subsequent AF processing such as subsequent DMF processing or multilayer laser cladding processing cannot be performed smoothly, but according to one embodiment of the present invention, since the space forming member 120 is stably seated in the seating groove 112, subsequent DMF When performing AF processing, such as machining or multi-layer laser cladding processing, it is possible to obtain an effect that stable metallurgical coupling of the space forming member 120 and the finishing unit 130 is possible.

On the other hand, in order to achieve the aforementioned metallurgical bonding, it may be formed by a direct metal fabrication (DMF) technique or a multilayer laser cladding technique. In this case, the DMF technique or the multi-layer laser cladding technique may be applied even when the surface of the space forming member 120 and / or the metal main body 110 to which the finish 130 is to be formed has a three-dimensional shape. There is this.

However, when the surface of the space forming member 120 and / or the main body of the metal product 110 has a planar two-dimensional surface to be formed in the finishing portion 130, SLS (selective) to form the finishing portion 130 Laser sintering (selective laser sintering) technology, SLM (selective laser melting) technology can also be used.

In addition to the AF technology, a known welding, plating, deposition, thermal spraying, or the like may be used to form the finishing unit 130.

In addition, before the finishing unit 130 is formed, the space forming member 120 is mounted in the mounting groove 112 in the mounting groove 112 through a method such as DMF, multilayer laser cladding, welding, or the like. It may be configured to remain fixed. When the space forming member 120 is formed of two or more separation members 121 and 122, the shape of the second space (cooling flow path) 125 may be stably maintained in the process of forming the finishing part 130. Before or after the space forming member 120 is mounted in the mounting groove 112, the boundary portion L may be bonded through DMF, multilayer laser cladding, welding, or the like.

After the finishing unit 130 is formed, a finishing process of smoothing the surface of the finishing unit 130 may be added.

Meanwhile, in FIG. 4, the cooling flow path formed in the metal product has a relatively simple shape, and one space forming member 120 is illustrated as being provided on the upper side of the metal product, but the shape of the cooling flow path is variously formed. The plurality of space forming members 120 and one or a plurality of finishing portions 130 covering the spaces may be used, and the mounting position of the space forming members 120 may also be located on the upper side of the metal product according to the shape of the cooling flow path. But it can be a variety of positions, such as the lower side.

Next, with reference to Figure 5 looks at a metal product formed an internal space according to another embodiment of the present invention.

FIG. 5 (a) shows a metal product having a space forming member 120 composed of two separating members 121 and 122 similarly to the metal product shown in FIG. 4, and FIG. Unlike the metal product of FIG. 4, the space forming member 120 is formed of one member.

As shown in Figure 5 (a), the space forming member 120 may be composed of a plurality of separating members (121, 122), a plurality of separating members (121, 122) in a state in which the metal product body ( It is mounted in the mounting groove 112 formed in the 110. Subsequently, the finishing unit 130 is formed by DMF technology, multilayer laser cladding technology, or the like to complete a three-dimensional metal product appearance. At this time, the first space 111 and the second space 125 are connected to each other in the same cross-sectional shape and cross-sectional area to form a cooling flow path while minimizing flow resistance, and thereby the surface of the metal product corresponding to the finish portion 130. Even efficient cooling can be performed.

On the contrary, as shown in FIG. 5B, the space forming member 120 is formed as one member, and the first space (1) is formed at the lower side in the state in which the space forming member 120 is mounted in the mounting groove 112. The second space 125 communicating with 111 may be formed. As described above, in the case of FIG. 5 (b), since an overhang structure having a space formed on the lower side can be achieved, there is an advantage in that a cooling flow path having an overhang structure that is difficult to implement by a DMF technique or a multilayer laser cladding technique can be formed.

In addition, in the case of FIG. 5B, since the second space 125 is completely exposed on one side of the space forming member 120, the space forming member 120 is not formed without separating the space forming member 120. The second space 125 can be formed by cutting, thereby allowing the space forming member 120 having the second space 125 to be formed in a simple manner. In addition, in the case of the metal product body 110, a straight portion of the first space 111 is formed by cutting such as drilling, and the first space 111 having a shape corresponding to the second space 125 through finishing cutting. ) Can be formed.

As such, by covering the space forming member 120 with the finish 130, a cooling flow path can be formed while minimizing the distance between the space forming member 120 and the surface of the finish 130, thereby increasing the surface temperature of the metal product. The cooling flow path can be set to be uniform, thereby achieving efficient surface cooling. In particular, by minimizing the depth of the mounting groove 112, it is possible to achieve a metallurgical coupling of the portion of the space forming member 120 and the finishing portion 130 exposed from the metal body 110, the space forming member ( The heat exchange between the 120 and the surface of the finish 130 is smoothly made to maximize the cooling efficiency.

A metal product 100 having an internal space according to another embodiment of the present invention will be described with reference to FIG. 6.

In the case of FIG. 6, the space forming member 120 is formed as one member as in the case of FIG. 5B, and the overhang structure in which the space is formed below is implemented as the space forming member 120.

As shown in detail in FIG. 6 (b), the first linear space 111 is formed in the metal body 110 by drilling or the like, and is connected to the mounting groove 112 and the second space 125. One space 111 is formed through cutting. Thereafter, the space forming member 120 is mounted in the mounting groove 112 such that the first space 111 of the space forming member 120 and the first space 111 of the metal product body 110 are connected to each other. In this case, the first space 111 includes about half of the U-shaped portion in which the flow path direction is changed, and the second space 125 has the other half of the U-shaped portion formed therein, and thus the metal main body 110 as a whole. And an internal space connected through the space forming member 120.

In addition, in the case of the metal product 100 having the internal space shown in FIG. 6, since the space forming member 120 forms an overhang structure that is difficult to manufacture by the MF technique or the multilayer laser cladding technique, the space forming member 130 is formed. The finishing unit 130 may be formed on the upper side of the by using a DMF technique or a multilayer laser cladding technique. Of course, in addition to such AF technology, the finishing unit 130 may be formed by welding, plating, deposition, thermal spraying, or the like.

Next, with reference to Figure 7 looks at the metal product 100 is formed with an internal space according to an embodiment of the present invention.

FIG. 7A illustrates a state in which the space forming member 120 is exposed to the outside of the mounting groove 112 as shown in FIGS. 4 and 5, and FIG. 7B illustrates the space forming member 120 as illustrated in FIG. 6. ) Is shown installed in a recessed state in the mounting groove (112).

In the case of FIG. 7 (a), the space forming member 120, the metal product body 110, and the space forming member 120 may be formed through metallurgical coupling, and thus, the space forming member 120 may be formed. Since heat transfer is smoothly performed between the coolant flowing through the second space 125 and the surface of the metal product corresponding to the finish 130, the cooling temperature of the surface of the metal product may be uniformly achieved.

However, in parts where cooling is not important or simply need to change the direction of the cooling flow path (for example, a part far from the surface of a metal product or a part adjacent to a surface where surface cooling is not important), FIG. As described above, it is possible to install the space forming member 120 in a recessed state in the mounting groove 112. In this case, when the top surface of the space forming member 120 and the top surface of the metal product body 110 are planar, the finishing portion 130 may be formed not only by DMF technology or multilayer laser cladding technology but also by SLS technology or SLM technology. Can be formed.

Finally, FIG. 8 illustrates a metal product 100 having an inner space having a plurality of space forming members 120.

As shown in FIG. 8, when the internal space is somewhat complicated, the first space 111 is formed in the main body 110 of the metal product through drilling or the like at the inlet 111a and the second space corresponding thereto ( After mounting a plurality of space forming member 120 having a 125 (Fig. 8 (a)), to form a finishing portion 130 covering the space forming member 120 (Fig. 8 (b)).

However, the shape of the metal product illustrated in FIG. 8 is just an example, and various shapes, numbers, and positions of the space forming member 120 may be varied depending on the shape of the internal space (cooling flow path) for cooling the surface of the metal product. Changes will be possible.

Next, with reference to Figure 4, it looks at with respect to the manufacturing method (S100) of the metal product (mold or various metal products that need cooling) formed an internal space according to another aspect of the present invention.

Method of manufacturing a metal product having an internal space (S100) according to an embodiment of the present invention, the step of preparing a metal product body 110 having a first space 111 formed therein (S120) and the first Preparing a space forming member 120 of a metal material in which the second space 125 is in communication with the space 111 (S130), and the first space 111 and the second space 125 to communicate with The process of mounting the space forming member 120 to the metal product body 110 (S140) and covering the space forming member 120 to form a finish 130 corresponding to the appearance of the metal product 100 It may include a step (S150), and may further include a finishing step (S160) for trimming the surface of the finish portion 130 after forming the finish portion 130.

In this case, the order of the step (S120) of preparing the metal product body 110 and the step (S130) of preparing the space forming member 120 can be changed.

First, the step (S120) of preparing the metal product main body 110 may be performed using a conventional machining method (for example, cutting, casting, etc.) or AF processing (DMF processing) to form an appearance of the metal product main body 110. Or multilayer laser cladding processing, etc.), or a process (S110) of forming an outer shape of the metal product body 110 by using a combination thereof (FIG. 4 (a)), and in this state, the metal product body 110. ), The first space 111 and the mounting groove 112 are formed through cutting such as drilling (FIG. 4 (b)).

On the other hand, as described above, since the portion forming the overhang structure or the flow path in the metal product 100 is formed by the space forming member 120, the metal product body 110 is simple in shape and DMF technology or multilayer laser cladding It is also possible to easily manufacture using AF technology such as technology. At this time, since the metal product body 110 does not have an overhang structure as described above, the metal product body 110 in which the first space 111 and the mounting groove 112 are also formed through AF technology such as DMF technology or multilayer laser cladding technology. ) Can be produced.

In addition, the step (S130) of preparing the space forming member 120 may also be performed by a conventional machining method (for example, cutting or casting), AF processing (such as DMF processing or multilayer laser cladding processing), or a combination thereof. The machining may be used to form the outer shape of the space forming member 120, and then the second space 125 may be formed through additional cutting (Fig. 4 (c)). However, it is also possible to manufacture the space forming member 120 formed up to the second space 125 by one process, for example, casting or AF processing (such as DMF processing or multilayer laser cladding processing).

Subsequently, the space forming member 120 is mounted in the mounting groove 112 of the metal product body 110 (S140, FIG. 4 (d)). In this case, the space forming member 120 includes a plurality of separating members 121. , 122) before or after the space forming member 120 is mounted in the mounting groove 112 so that the second space 125 can be maintained in a stable state in the process of forming the finishing unit 130. A process of bonding the boundary portions L of the separating members 121 and 122 to the DMF technique, the multilayer laser cladding technique, the welding, and the like (FIG. 4 (d ')) may be further performed.

As such, the finishing unit 130 is formed in the state where the space forming member 120 is mounted on the metal product body 110 to form the exterior of the metal product (FIG. 4 (e) and S150). As described above, the finishing unit 130 is preferably metallized with the metal product body 110 and the space forming member 120. For example, the finishing unit 130 may be formed by a DMF technique or a multilayer laser cladding technique. Can be formed. However, when the surface of the surface 130 that is the base of the finish 130 is planar, SLS technology, SLM technology may be used, and regardless of the shape of the finish 130, conventional welding, plating, deposition, thermal spraying, etc. Can also be used.

Then, as shown in FIG. 4 (f), the metal product 100 having an internal space may be finally completed through a finishing process (FIG. 4 (f)) through finishing cutting as shown in FIG. 4 (f).

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I want to make it clear.

100 ... metal products 110 ... metal products
111 ... 1st space 112 ... Mounting groove
120 ... Space forming member 121, 122 ... Separation member
125. 2nd space 130 ... Finishing part

Claims (19)

A metal product body having a first space formed therein;
A second space communicating with the first space, the space forming member mounted to the metal product body; And
A finishing part covering the space forming member to form an appearance while the space forming member is mounted on the metal product body;
Metal product formed with an inner space comprising a. The method of claim 1,
The metal product body is provided with a mounting groove in which the space forming member is mounted, the space forming member is mounted to the mounting groove only a part of the inner space is characterized in that the remaining portion is exposed to the outside of the metal product body Formed metal products. The method of claim 1,
The metal product body is provided with a mounting groove in which the space forming member is mounted, the space forming member is a metal product having an internal space, characterized in that the exposure groove is not exposed to the outside. The method of claim 1,
The space forming member is a metal product having an internal space, characterized in that formed with one member formed with the second space. The method of claim 1,
The space forming member is formed by combining two or more separating members, the metal product having an internal space, characterized in that to form the second space in the state in which the separating member is coupled. The method of claim 1,
The space forming member is a metal product having an internal space, characterized in that the second space connected to the first space is formed in the lower portion to form an overhang structure with a space formed on the lower side as a whole. The method according to any one of claims 1 to 5,
The metal product is a metal product that requires a mold or cooling,
The space forming member is made of a metal material,
And the first space and the second space are cooling passages. The method of claim 7, wherein
The space forming member is a metal product having an internal space, characterized in that for forming a curvature portion in which the direction of the cooling passage is changed, or forming an overhang portion formed with a space on the lower side of the cooling passage. 7. The method according to any one of claims 1 to 6,
The space forming member is formed of the same material as the metal product body or metal product having an internal space, characterized in that formed of a material having a higher corrosion resistance than the metal product body. 7. The method according to any one of claims 1 to 6,
The finishing unit is a metal product having an internal space, characterized in that the metal product body and the metal member is formed with the space forming member. Preparing a metal product body having a first space formed therein;
Preparing a space forming member made of a metal material having a second space communicating with the first space;
Mounting the space forming member on the metal product body such that the first space and the second space communicate with each other; And
Forming a finishing part covering the space forming member to correspond to the appearance of the metal product;
Method of manufacturing a metal product formed with an inner space comprising a. The method of claim 11,
The first space of the metal product body includes a straight portion and the straight portion is formed by drilling,
The second space of the space forming member includes a curved portion, wherein the curved portion is formed by any one or a combination of cutting, casting, AF processing or a method of manufacturing a metal product with an internal space is formed . The method of claim 11,
The metal product body and the space forming member are formed by any one of cutting, casting, AF processing or a combination thereof, and the straight portion constituting the first space of the metal product body is formed by drilling. Method for manufacturing a metal product, characterized in that the inner space is formed. The method of claim 11,
The finishing part is a metal product manufacturing method with an inner space, characterized in that the metal product body and the space forming member and the metal coupling. The method of claim 11,
The finishing part is a method of manufacturing a metal product with an internal space, characterized in that formed by direct metal fabrication (DMF) technology or multilayer laser cladding technology. The method of claim 11,
The finishing part is formed by at least one method of selective laser sintering (SLS) technology, selective laser melting (SLM) technology, welding, plating, deposition, thermal spraying Method for producing the formed metal product. The method of claim 11,
The space forming member is formed by combining two or more separating members, and forms the second space in a state in which the separating member is coupled,
The space forming member is a method of manufacturing a metal product with an internal space characterized in that it further comprises the step of bonding the boundary of the separating member before or after being mounted in the mounting groove formed in the metal product body. The method according to any one of claims 11 to 17,
The metal product is a metal product that requires a mold or cooling,
And the first space and the second space are cooling passages. 19. The method of claim 18,
And the space forming member forms a curvature portion in which the direction of the cooling flow path is changed, or forms an overhang portion in which a space is formed at a lower side of the cooling flow path.

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